WO2017119799A1 - Apparatus and method for manufacturing cable-type secondary battery, and cable-type secondary battery manufactured according to same - Google Patents

Abstract

The present invention discloses a method for manufacturing a cable-type secondary battery, wherein the method includes a step of winding a first electrode member, a separation membrane ribbon and a second electrode member around a rod-type mandrel, wherein the width of the first electrode member and the width of the second electrode member are respectively shorter than the perimeter of the mandrel, and the width of the separation membrane ribbon is longer than the perimeter of the mandrel.

Description

Apparatus and method for manufacturing cable type secondary battery and cable type secondary battery manufactured accordingly

This application claims priority based on Korean Patent Application No. 10-2016-0002252 filed on January 7, 2016, and all the contents disclosed in the specification and drawings of the application are incorporated in this application.

The present invention relates to a cable type secondary battery, and more particularly, to an apparatus and method for manufacturing a cable type secondary battery having a structure for automatically manufacturing a cable type secondary battery, and a cable type secondary battery manufactured accordingly.

Lithium secondary batteries are widely used in various portable electronic devices such as personal computers, camcorders, portable telephones, portable CD players, PDAs, and the like because of their high energy density, high operating voltage, and excellent retention and life characteristics.

In general, a lithium secondary battery includes a cylindrical or rectangular case and an electrode assembly accommodated in the case together with an electrolyte. Here, the electrode assembly is a laminate of a positive electrode, a separator and a negative electrode, and typically has a winding structure or a stack structure in the form of a jelly-roll.

In addition, recently, a cable type secondary battery capable of freely changing its shape and being applicable to various fields has been introduced. A cable type secondary battery has a very large ratio of length to diameter, and includes a hollow anode layer, a separator surrounding the anode layer, and a cathode layer surrounding the separator.

The technology related to the cable type secondary battery is disclosed in Korean Patent Laid-Open Publication No. 2013-0040160.

Korean Laid-Open Patent Publication No. 2013-0040160 discloses a lithium ion supply core part including an electrolyte and two or more wire-type current collectors formed on the outer surface of the lithium ion supply core part and coated with an inner electrode active material on the outer surface. An inner electrode including a spiral electrode twisted by a second electrode, a separation layer for preventing a short circuit of an electrode formed around the outer surface of the inner electrode, and an outer electrode active material layer and an outer current collector formed around the outer surface of the separation layer. Disclosed is a cable type secondary battery having a horizontal cross section of a predetermined shape including an external electrode provided and extending in a longitudinal direction.

However, the cable-type secondary battery is difficult to mass-produce due to the lack of technical means for automatically assembling the internal electrode, the separator and the external electrode, and thus, a countermeasure is required.

The present invention has been made in consideration of the technical background as described above, by continuously connecting the inner electrode, the separator and the external electrode constituting the cable-type secondary battery of the cable-type secondary battery that can automate the assembly process of the cable-type secondary battery It is an object of the present invention to provide a manufacturing apparatus and method and a cable type secondary battery manufactured accordingly.

The present invention to achieve the above object is the core of the rod form; And battery element supply means including a first electrode bobbin for continuously supplying the first electrode member, a separator bobbin for continuously supplying the separator ribbon, and a second electrode bobbin for continuously supplying the second electrode member; And rotating the at least one of the core and the battery element supplying means to twist the first electrode member, the separator ribbon, and the second electrode member in the circumference of the core in the longitudinal direction of the core. It provides a cable type secondary battery manufacturing apparatus.

Apparatus for manufacturing a cable-type secondary battery according to the present invention includes a support that is rotatably installed around an axis coinciding with the axis of the winding core, wherein the first electrode bobbin is arranged in a plurality at regular intervals so as to surround the winding core Each support may be rotatably mounted.

The separator bobbin and the second electrode bobbin may be integrally rotated by being mounted on a common rotation frame rotatably installed about an axis coinciding with the axis of the winding core.

The separator bobbin and the second electrode bobbin may be installed to adjust the winding angle with respect to the winding core, respectively.

An apparatus for manufacturing a cable type secondary battery according to the present invention includes a first supporting rod for supporting the separator bobbin and a second supporting rod for supporting the second electrode bobbin, wherein the first supporting rod and the second supporting rod are pivoted, respectively. It may be installed in the common rotating frame to enable rotation for adjusting the angle around the part.

The separator bobbin and the second electrode bobbin may be mounted on the first rotation rod and the second rotation rod rotatably installed around the axis coinciding with the axis of the winding core, respectively, to rotate independently of each other.

The first electrode member preferably has a structure in which a negative electrode active material for a secondary battery is coated on a wire.

The second electrode member may have a strip structure.

The width of the first electrode member and the width of the second electrode member are preferably smaller than the winding circumference length, and the width of the separator ribbon is larger than the winding circumference length.

When the cross section of the winding core is circular, the width W of each of the first electrode member and the second electrode member is calculated by the formula,

W <D x π (D: winding inside diameter, π: circumference)

It is desirable to satisfy.

When the cross section of the winding core is elliptical, the width W of the first electrode member and the second electrode member are respectively calculated by the formula,

W <L (L: winding circumference length)

It is desirable to satisfy.

The width W of the separator ribbon preferably satisfies the calculation formula, W> 2D × π (D: wound inner diameter, π: circumferential ratio) when the membrane ribbon is wound in two layers.

It is preferable that the width of the first electrode member is 0.4 to 0.5 mm, the width of the separator ribbon is 7 mm or less, and the width of the second electrode member is 3 mm or less.

The separator ribbon may be stranded such that 50% or less of the entire width overlaps.

According to another aspect of the present invention, (a) a first electrode bobbin capable of continuously supplying a first electrode member, a separator bobbin capable of continuously supplying a separator ribbon, and a second electrode member around a rod-shaped core Disposing a second electrode bobbin capable of supplying continuously; (b) twisting the first electrode member of the strip structure to the outside of the core by rotating the first electrode bobbin about an axis coinciding with the axis of the core; (c) twisting the separator ribbon on the outside of the first electrode member by rotating the separator bobbin about an axis coinciding with the axis of the winding core; And (d) twisting the second electrode member having a strip structure to the outside of the separator ribbon by rotating the second electrode bobbin about an axis coinciding with the axis of the winding core. A width and a width of the second electrode member are each smaller than the winding circumference length, and the width of the separator ribbon is larger than the winding circumference length is provided a method of manufacturing a cable-type secondary battery.

According to another aspect of the invention there is provided a cable-type secondary battery manufactured by the above manufacturing method.

According to the present invention, an automated system for automatically performing the assembly process of the cable type secondary battery while continuously supplying the negative electrode wire, the separator ribbon, and the positive electrode wire forming the cable type secondary battery is constructed, thereby improving productivity of the cable type secondary battery. Can be improved.

The following drawings attached to this specification are illustrative of the preferred embodiments of the present invention, and together with the detailed description of the invention to serve to further understand the technical spirit of the present invention, the present invention is a matter described in such drawings It should not be construed as limited to.

1 is a perspective view schematically showing a main configuration example of a cable type secondary battery manufacturing apparatus according to the present invention.

2 is a perspective view showing the configuration of a cable type secondary battery manufacturing apparatus according to an embodiment of the present invention.

3 is a perspective view showing the configuration of a cable type secondary battery manufacturing apparatus according to another embodiment of the present invention.

1 is a perspective view schematically showing a main configuration example of a cable type secondary battery manufacturing apparatus according to the present invention.

Referring to FIG. 1, a cable type secondary battery manufacturing apparatus supplies a first core member 1, a separator ribbon 2, and a second electrode member 3 to a core 100 in a rod form and a core 100. Battery element supply means. The battery element supply means includes a first electrode bobbin 110 for continuously supplying the first electrode member 1, a separator bobbin 120 for continuously supplying the separator ribbon 2, and a second electrode member 3. It includes a second electrode bobbin 130 for continuously supplying.

The core 100 may be implemented by a rod-shaped rod having a predetermined length and diameter. Since the core 100 is constituted by, for example, a rod having a small diameter of 0.5 mm, the core 100 is in contact with and supported by a predetermined support structure coated with a polymer to prevent bending due to tension of the wire rod during the twisted pair process. desirable.

The first electrode bobbin 110 is a bobbin to which the first electrode member 1 used to form the internal electrode of the cable type secondary battery is wound. The first electrode member 1 has a structure in which a conventional negative electrode active material for a lithium secondary battery is coated on a copper wire. Preferably, the first electrode member 1 is spirally wired to provide a negative electrode of the cable type secondary battery.

A plurality of first electrode bobbin 110 is arranged at a predetermined interval to a predetermined support 111 so as to surround the core 100, each rotatable to the support 111 to enable the unwinding of the first electrode member (1). Is fitted. To this end, the support 111 may be provided with a support arm 111a for supporting each of the first electrode bobbin 110 radially.

The separator bobbin 120 is a bobbin to which the separator ribbon 2 used to form the separator of the cable type secondary battery is wound. As the separator ribbon 2, a conventional separator film for lithium secondary batteries processed in the form of a ribbon can be employed.

The second electrode bobbin 130 is a bobbin to which the second electrode member 3 used to form the external electrode of the cable type secondary battery is wound. The second electrode member 3 has a structure in which a conventional cathode active material for lithium secondary batteries is coated on a conductor strip. Preferably, the second electrode member 3 is spirally wired to provide a positive electrode of the cable type secondary battery.

The cable type secondary battery manufacturing apparatus operates to sequentially twist the first electrode member 1, the separator ribbon 2, and the second electrode member 3 around the core 100 along the longitudinal direction of the core 100. do. To this end, the first electrode bobbin 110, the separator bobbin 120 and the second electrode bobbin 130 are preferably arranged in order while going in the axial direction of the core 100.

The apparatus for manufacturing a cable-type secondary battery rotates at least one of the core 100 and the battery element supplying means so that the first electrode member 1 and the separator are formed around the core 100 along the longitudinal direction of the core 100. The ribbon 2 and the second electrode member 3 are twisted in sequence. Hereinafter, the configuration of the present invention will be described based on a method of manufacturing a cable type secondary battery by rotating the battery element supply means without rotating the core 100.

According to one embodiment of the present invention, as shown in Figure 2 is installed rotatably around the axis coinciding with the core 100, the support 111 for supporting the first electrode bobbin 110 and the membrane bobbin 120 And a common rotating frame 140 supporting the second electrode bobbin 130 collectively. In this embodiment, the winding core 100 is installed to be able to move forward in the axial direction.

The support 111 is configured to have a substantially disk-shaped body, and supports the first electrode bobbin 110 and simultaneously rotates the first electrode bobbin 111 around the core 100 to form a first electrode member ( 1) serves to twist the winding around the core (100). Here, the core 100 is preferably disposed to penetrate the center of the support 111.

The common rotating frame 140 supports the separator bobbin 120 and the second electrode bobbin 130, and simultaneously rotates the separator bobbin 120 and the second electrode bobbin 130 along the periphery of the core 100. The ribbon 2 and the second electrode member 3 serve to strand around the core 100. In this case, the separator bobbin 120 and the second electrode bobbin 130 are rotatably mounted to the common rotating frame 140 to allow the separator ribbon 2 and the second electrode member 3 to be unwound.

The separator bobbin 120 and the second electrode bobbin 130 are spaced apart from each other in the axial direction of the core 100 on the common rotating frame 140. In addition, the separator bobbin 120 and the second electrode bobbin 130 are installed on the common rotating frame 140 so as to be located on opposite sides of each other with respect to the core 100. To this end, both sides of the common rotating frame 140 are provided with a first frame 141 and a second frame 142 of a predetermined shape to support the separator bobbin 120 and the second electrode bobbin 130, respectively.

Since the separator bobbin 120 and the second electrode bobbin 130 are integrally rotated around the core 100 by the common rotating frame 140, the winding angle around the core 100, that is, the adjustment of the winding angle is controlled. It is preferable to make each independently. To this end, the first support rod (120a) for supporting the membrane bobbin 120 and the second support rod (130a) for supporting the second electrode bobbin 130 is rotated for the angle adjustment by different pivot parts (121,131). It is installed in the first frame 141 and the second frame 142, respectively.

In the cable type secondary battery manufacturing apparatus having the above configuration, the first electrode bobbin 110, the separator bobbin 120, and the second electrode bobbin 130 are rotated as the support 111 and the common rotating frame 140 rotate. The first electrode member 1, the separator ribbon 2, and the second electrode member 3 are sequentially twisted around the core 100 moving in the axial direction while rotating along the core 100. do. As a result, a winding cell is formed around the core 100 in a lengthwise direction and in the radial direction. The winding cell thus manufactured is cut out in a predetermined length unit and separated from the winding core 100 in the axial direction.

According to another exemplary embodiment of the present invention, as shown in FIG. 3, the support 111 is rotatably installed around the axis coinciding with the axis of the core 100 to support the first electrode bobbin 110, and the separation membrane. Provided is a cable type secondary battery manufacturing apparatus including a first rotating rod 123 and a second rotating rod 133 supporting the bobbin 120 and the second electrode bobbin 130, respectively. In this embodiment, the core 100 remains fixed so as not to move in the axial direction.

The separator bobbin 120 and the second electrode bobbin 130 are end portions of the first rotating rod 123 and the second rotating rod 133 that are individually rotatable about a rotation axis coinciding with the axis of the core 100. Mounted on the part to rotate independently of each other.

In the cable type secondary battery manufacturing apparatus having the above configuration, the first electrode bobbin 110 and the separator bobbin 120 are rotated as the support 111, the first rotating rod 123, and the second rotating rod 133 rotate. And the second electrode bobbin 130 rotates around the core 100 to sequentially twist the first electrode member 1, the separator ribbon 2, and the second electrode member 3 around the core 100. Perform the action. As a result, a winding cell is formed around the core 100 in a lengthwise direction and in the radial direction. After the winding cell is formed, the winding core 100 is removed from the winding cell to obtain a cable type secondary battery.

Among the cell elements spirally wound on the core 100, the width of the first electrode member 1 and the width of the second electrode member 3 are respectively smaller than the winding circumference length of the corresponding battery element, and the width of the separator ribbon 2 is reduced. The width is designed to be larger than its winding circumference length. Here, the 'width' refers to the maximum distance across each cell element perpendicular to its longitudinal direction. The 'wound circumferential length' refers to a circumferential length measured in a direction perpendicular to the longitudinal direction of the core 100 in a state in which the battery element is spirally wound on the outside of the core 100.

When the cross section of the core 100 is circular, each of the first electrode member 1 and the second electrode member 3 is designed to satisfy the relational expression, W &lt; Where W is the width of each battery element, D is the inner diameter of the winding of each battery element, and π represents the circumference. More specifically, referring to FIG. 3, the width W1 of the first electrode member 1 satisfies the relation W1 <D × π, and the width W3 of the second electrode member 3 is the relation W3 < Satisfies D x π. According to this structure, the 1st electrode member 1 and the 2nd electrode member 3 can respectively be wound up efficiently spirally around the core 100 without overlapping.

For example, when the diameter of the core 100 is 0.5 mm, since the winding inner diameter of the first electrode member 1 wound just outside the core 100 becomes 0.5 mm, the diameter of the first electrode member 1 The width W1 is designed to be 1.57 mm (= 0.5 mm x 3.14) or less.

Assuming that the thickness of the first electrode member 1 is 0.4 mm, the winding inner diameter of the separator ribbon 2 is 1.3 mm (= 2 x 0.4 mm + 0.5 mm), so that the width W2 of the separator ribbon 2 is determined. When designed to be 4.082 mm (= 1.3 mm x 3.14) or less, the separator ribbon 2 can be wound into a single layer without overlapping.

In order to prevent the occurrence of a short between the first electrode member 1 and the second electrode member 3, it is optimal for the separator ribbon 2 to be wound so that at least part thereof overlaps with two layers. The width W2 of the separator ribbon 2 is designed to satisfy the formula, W> 2D × π, when it is wound in two layers. Here, D is a coiling inner diameter and (pi) is a circumference.

For example, if the width W2 of the separator ribbon 2 is designed to be larger than 8.164 mm (= 2 x 1.3 mm x 3.14), the separator ribbon 2 may be wound in two layers.

When the cross section of the core 100 is elliptical, among the battery elements spirally wound on the core 100, the width of each of the first electrode member 1 and the second electrode member 3 is represented by the relation W <L. It is designed to satisfy. Here, W denotes the width of each battery element, and L denotes the winding circumference length of each battery element. More specifically, referring to FIG. 3, the width W1 of the first electrode member 1 satisfies the relation W1 <L, and the width W3 of the second electrode member 3 represents the relation W3 <L. Satisfies.

The width W1 of the first electrode member 1 is 0.4 to 0.5 mm so that the electrode members 1 and 3 and the separator ribbon 2 can be efficiently supplied and wound during the operation of the cable type secondary battery manufacturing apparatus. The width W2 of the separator ribbon 2 is preferably 7 mm or less and the width W3 of the second electrode member 3 is limited to 3 mm or less.

In order for the separator ribbon 2 to be wound around the core 100 without gap, it is preferable that the separator ribbon 2 is stranded so that 50% or less of the entire width overlaps. In this case, the winding angle of the separator ribbon 2 is 21 to 24 degrees, and the winding angle of the second electrode member 3 is preferably limited to 25 to 28 degrees.

As described above, the apparatus for manufacturing a cable type secondary battery according to the present invention continuously supplies the first electrode member 1, the separator ribbon 2, and the second electrode member 3 constituting the cable type secondary battery, thereby winding the core 100. Cable type secondary battery can be mass-produced by automatically performing an assembly process of forming winding cells in which inner electrodes, separators, and external electrodes are sequentially wired around.

According to another aspect of the present invention, a process of arranging bobbins as a battery element supply means around a rod-shaped core, and rotating the respective bobbins with the supply of the battery elements, allows the first electrode member ( 1), there is provided a method of manufacturing a cable type secondary battery which performs a step of winding and winding the separator ribbon 2 and the second electrode member 3 in sequence.

In the bobbin arrangement process, the first electrode bobbin 110, the separator bobbin 120, and the second electrode bobbin 130 are disposed at predetermined angles, respectively. That is, the first electrode bobbin 110 capable of continuously supplying the first electrode member 1 having the strip structure, the separator bobbin 120 capable of continuously supplying the separator ribbon 2, and the second structure having the strip structure The 2nd electrode bobbin 130 which can supply the electrode member 3 continuously is arrange | positioned around the core 100.

The first electrode member 1, the separator ribbon 2, and the second electrode member 3 are wound around the first electrode bobbin 110, the separator bobbin 120, and the second electrode bobbin 130, respectively, as battery elements. . Here, the width of the first electrode member 1 and the width of the second electrode member 3 are respectively wound around the winding so that overlap does not occur when the wire is spirally circumferentially wound around the core 100 by a twisted pair process. It is set to have a value smaller than the length. In addition, the width | variety of the separator ribbon 2 is set so that it may have a value larger than the winding circumference length so that overlap may arise when it becomes spirally wound around the core 100 by a stranding process.

In the twisted pair process, the first electrode bobbin 110 is rotated about an axis coinciding with the axis of the core 100 to spirally wound the first electrode member 1 of the strip structure around the core 100 to twist the wire. And a process of rotating the separator bobbin 120 about an axis coinciding with the axis of the core 100 to spirally wind the separator ribbon 2 on the outside of the first electrode member 1, and twisting the wire. The second electrode bobbin 130 is rotated about an axis coinciding with the axis of the &lt; RTI ID = 0.0 &gt;), &lt; / RTI &gt; Perform.

In performing the method of manufacturing the cable type secondary battery according to the present invention, the width of each battery element for efficient supply and winding treatment of the first electrode member 1, the separator ribbon 2, and the second electrode member 3 is related. Since the numerical range configuration is the same as described above, a detailed description thereof will be omitted.

According to another aspect of the present invention, the first electrode member 1, the separator ribbon 2, and the second electrode member 3 are sequentially stranded and the battery elements are stacked in the radial direction. In addition, a cable type secondary battery having a structure in which a width-related numerical range configuration of each battery element is described above is provided.

When applying the present invention it is possible to improve the productivity of the cable-type secondary battery by automatically assembling the cable-type secondary battery.

Claims (21)

1. Core in the form of a rod; And

   A battery element supplying means including a first electrode bobbin for continuously supplying the first electrode member, a separator bobbin for continuously supplying the separator ribbon, and a second electrode bobbin for continuously supplying the second electrode member; ,

   At least one of the core and the battery element supplying means is rotated so that the first electrode member, the separator ribbon, and the second electrode member are sequentially stranded around the core in the longitudinal direction of the core. Apparatus for manufacturing type secondary battery.
2. The method of claim 1,

   And a support installed rotatably about an axis coinciding with the axis of the winding core,

   The plurality of first electrode bobbins are arranged at regular intervals so as to surround the core, and the cable type secondary battery manufacturing apparatus, characterized in that rotatably mounted to each of the support.
3. The method of claim 2,

   The separator bobbin and the second electrode bobbin are mounted to a common rotary frame rotatably installed about an axis coinciding with the axis of the core, and are integrally rotated.
4. The method of claim 3,

   The separator bobbin and the second electrode bobbin, respectively, the apparatus for manufacturing a cable type secondary battery, characterized in that the winding angle can be adjusted to the core.
5. The method of claim 4, wherein

   A first supporting rod for supporting the separator bobbin and a second supporting rod for supporting the second electrode bobbin,

   The first support rod and the second support rod is a cable-type secondary battery manufacturing apparatus, characterized in that installed in the common rotation frame to enable rotation for adjusting the angle around the pivot.
6. The method of claim 2,

   The separator bobbin and the second electrode bobbin are mounted on the first rotation rod and the second rotation rod rotatably installed around the axis coinciding with the axis of the winding core, respectively, and rotate independently of each other. Manufacturing apparatus.
7. The method of claim 1,

   The first electrode member is a cable-type secondary battery manufacturing apparatus, characterized in that the wire has a structure coated with a negative electrode active material for a secondary battery.
8. The method of claim 7, wherein

   The second electrode member is a cable-type secondary battery manufacturing apparatus, characterized in that consisting of a strip structure.
9. The method of claim 8,

   The width of the first electrode member and the width of the second electrode member are each smaller than the winding circumference length,

   The width of the separator ribbon is a manufacturing apparatus of a cable type secondary battery, characterized in that greater than the length of the winding circumference.
10. The method of claim 9,

    The core is circular in cross section,

    Width W of the first electrode member and the second electrode member is respectively calculated,

    W <D x π (D: winding inside diameter, π: circumference)

    Apparatus for manufacturing a cable-type secondary battery, characterized in that the satisfactory.
11. The method of claim 9,

    The core is elliptical in cross section,

    Width W of the first electrode member and the second electrode member is respectively calculated,

    W <L (L: winding circumference length)

    Apparatus for manufacturing a cable-type secondary battery, characterized in that the satisfactory.
12. The method of claim 9,

    When the width (W) of the separator ribbon is wound in two layers overlapping formula,

    W> 2D x π (D: winding inner diameter, π: circumference)

    Apparatus for manufacturing a cable-type secondary battery, characterized in that the satisfactory.
13. The method of claim 1,

    The width of the first electrode member is 0.4 ~ 0.5mm, the width of the separator ribbon is 7mm or less, the width of the second electrode member is 3mm or less manufacturing apparatus of the cable type secondary battery.
14. The method of claim 13,

    The separator ribbon is a cable-type secondary battery manufacturing apparatus, characterized in that the stranded so that 50% or less of the entire width overlap.
15. (a) Around the core in the form of a rod, a first electrode bobbin capable of continuously supplying the first electrode member, a separator bobbin capable of continuously supplying the separator ribbon, and a second capable of continuously supplying the second electrode member Placing an electrode bobbin;

    (b) twisting the first electrode member of the strip structure to the outside of the core by rotating the first electrode bobbin about an axis coinciding with the axis of the core;

    (c) twisting the separator ribbon on the outside of the first electrode member by rotating the separator bobbin about an axis coinciding with the axis of the winding core; And

    (d) twisting the second electrode member of the strip structure to the outside of the separator ribbon by rotating the second electrode bobbin about an axis coinciding with the axis of the winding core;

    The width of the first electrode member and the width of the second electrode member are each smaller than the winding circumference length, the width of the separator ribbon is larger than the winding circumference length, the manufacturing method of the cable-type secondary battery.
16. The method of claim 15,

    In step (a),

    Place the core with a circular cross section,

    Width W of the first electrode member and the second electrode member is respectively calculated,

    W <D x π (D: winding inside diameter, π: circumference)

    Method of manufacturing a cable-type secondary battery, characterized in that to satisfy.
17. The method of claim 15,

    In step (a),

    Place the core with an elliptical cross section,

    Width W of the first electrode member and the second electrode member is respectively calculated,

    W <L (L: winding circumference length)

    Method of manufacturing a cable-type secondary battery, characterized in that to satisfy.
18. The method of claim 15,

    When the width (W) of the separator ribbon is wound in two layers overlapping formula,

    W> 2D x π (D: winding inner diameter, π: circumference)

    Method of manufacturing a cable-type secondary battery, characterized in that to satisfy.
19. The method of claim 15,

    The width of the first electrode member is 0.4 ~ 0.5mm, the width of the separator ribbon is 7mm or less, the width of the second electrode member is a manufacturing method of a cable type secondary battery.
20. The method of claim 19,

    In step (c),

    The separator ribbon is a cable-type secondary battery manufacturing method characterized in that the twisted wire so that 50% or less of the entire width overlap.
21. Cable type secondary battery manufactured by the manufacturing method of any one of Claims 15-20.

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